Shoulder-bead for use in dry wall construction



April 22, 1952 NL 2,593,859

SHOULDER-BEAD FOR USE IN DRY WALL CONSTRUCTION Filed July 12, 1949 /5/2#7 5 9? 19 2 Jay. .3- y- INVENTOR.

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Patented A r. 22, 1952 SHOULDER-HEAD FOR USE IN DRY WALL CONSTRUCTIONArthur H. Dunlap, Seattle, Wash.

Application July 12, 1949, Serial N 0. 104,220

This invention relates to crowning assemblies particularly adapted foruse in dry-wall construction on an outside corner formed by twoangularly disposed abutting sheets of wall-board, or on the exposedcorner presented by a sheet of wall-board which abuts a door or windowjamb. The invention aims to provide a structure superior to thecorner-bead assemblies illustrated and described in my pendingapplications for Letters Patent of the United States, Serial No. 63,689,filed December 6, 1948, and Serial No. 81,549, filed March 15, 1949.

It is an object of my invention to provide a corner crowning assemblysuperior to the cornerbeads shown in the said prior applications in thatit can be used without beveling or other wise altering the corner formedby two angularly disposed abutting sheets of wall-board.

1 Claim. (Cl. 20-74) It is a further object of my invention to provide acrowning assembly capable of dressing and protecting the exposed sideedge of a sheet of wall-board abutting a door or window jamb.

Still another object of my invention is to provide crowning assembliesadapted for use in drywall construction on a rounded corner, or arounded side edge of a sheet of wall-board.

A further object of my invention is to provide crowning assembliescapable of being easily set in position and held therein only by puttyor the like applied sparingly over portions of my assemblies and theadjacent surfaces of the wallboard.

These and other objects will be revealed in the following detaileddescription of my invention.

In the accompanying drawing:

Figure 1 is a horizontal sectional view showing an embodiment of thepresent? invention as applied to dress an abrupt outside corner of adry-wall room, the wall boards being shown fragmentarily.

Fig. 2 is a similar view of a modification of the invention particularlyformed to adapt itself to a rounded corner.

Fig. 3 is a horizontal sectional view of a further modification of theinvention shown applied to dress oil a bull-nosed edge of a sheet ofwallboard where the latter laps a door or window jamb; and

Fig. 4 is a view similar to Fig. 3 excepting that I have here shown theinvention as being particularly formed to adapt itself to a square edge.

Referring to Fig. 1 of the said drawing, the

corner crowning assembly therein illustrated incorporates an elongatedcorner-crowning piece 5 composed of plastic, metal, or any otherrelatively inflexible material and formed to an angular shape incross-section, the V-channel which this angular shape produces enablingthe cornerpiece to find close-seating engagement over an outside cornerproduced by two angularly dis-,- posed lapped sheets of wall-board,designated by I0 and II, applied as a dry-wall surfacing for a roomframed with the usual studs l2. Said corner-piece has a strip oftape-like pliable material glued or otherwise securely bonded to itsunderside, and the width of this tape is such as to leave free wings Iprojecting well beyond each side edge of the corner-piece. A heavy gradeof strong paper and such, for example, as kraft stock is eminentlysuitable as the material of the tapes composition.

It is to be understood that the corner-piece and its facing tape areavailable as a factorymade unit assembly, and the manner of applicationis shown in Figure 1, and namely such as to have the corner-piece seatsnugly over the squared-off corner of the lapped sheets of wall-:- boardwith the free wings projecting in opposite directions loosely overlyingthe outer faces of the two sheets of wall-board adjacent their meet ingends. When setting the corner-piece the wing sections may, if desired,be tacked or spotglued to the underlying wall-board preparatory toapplication of a layer l3 of Swedish putty or other like or suitableplaster-like substance, but this is not necessary inasmuch as anoperator can easily hold the corner-piece in position while trowelling athin layer of said putty over the wings. The usual practice, in applyingthe putty, is to utilize only so much as is necessary to draw the sameflush with the exposed face of the angular corner-piece and thethickness of the corner-pieces side edge l5 serves as a gauge for thispurpose. The applied putty may, if de'.- sired, be given thickersubstance sufficient to coat the corner-piece. In either such case, thearea of greatest thickness occurs adjacent the side edges I5 and taperstherefrom at each side of the corner-piece to a substantial feather-edgeat a point laterally removed beyond the end limit of the related wing.When paint is later applied to the wall, the corner which has been facedwith my crowning assembly gives a smooth and unbroken appearance almostincapable of being distinguished from a lath-and-plaster surface. In theembodiment which I have illustrated in Fig.

2 the outer one of the two lapped sheets of wallboard, designated by H,is indicated as having been sanded down or otherwise so made as to roundofi the outside corner which the two sheets produce, and thecorner-piece here provided is given an arcuate shape in transversesection to compensate the same to this rounded shape. In all particularsother than its said sectional configuration the corner-crowning assemblyshown in Fig. 2 is the same as that shown in Figure 1.

In Figs. 3 and 4 I have shown embodiments of the invention adapted to beused for trimming around door and window openings in dry-wall houseconstruction to give, as with the cornercrowning assemblies, the smoothand unbroken appearance which, heretofore, has been thought to bepossible only by employing lath-and-plaster as the finishing material.In these views, ll denotes the cripple which frames the door or thewindow opening, as the case may be, it desighates the jamb, and I8 and2B designate, in Figs. 3 and 4, respectively, a sheet of wall-boardwhich is brought beyond the cripple into lapping relation to the jamb.In Fig. 3 I show the sheet as having its end edge rounded off and inFig.4 I show the edge as being squared off. The crowning' members whichI provide for these end edges are quite similar, one to the other, andare, in fact, not unlike the corner-crowning members heretoforedescribed. In the instance of either type of end-edge crown, and namelybull-nosed or square, a strip of tape is similarly glued or otherwiseaffixed to the inside surface of a backing piece of metal, plastic orother like or suitable relatively inflexible material which has beenpressed into the shape necessary to adapt itself to the end edge whichit is to overlie. In Fig. 3 the backing piece is bent upon itself alonga longitudinal line and one of the two sections thereby formed anddesignated by 6 is substantially straight or plane and the other of thetwo sections, designated by 8, has an arcuate shape almost identicalwith the corner-piece 5 shown in Fig. 2. The tape I9 in this arrangementneed only project laterally from one side edge limit of the backingpiece, and more especially from the side edge of the arcuate-shapedsection. In applying the style of crowning member here illustrated, theprocedure is to slip the same over the end edge of the wall-board beforethe latter is set in place and then localize the two by driving aflat-headed nail (not shown) into the cripple 1.1, the nail being drivenfrom the outside face of the wall-board to pass through the board-andcoincidently catch the underlying section 6' of the crowning member. Thefly section of the tape I9 is then pressed down over the head of thenail and Swedish putty 2-3 is applied over this fly section andtrowelled smoothin the manner previously described. In Fig. 4 thebacking piece for the tape is sectionally of a double-L shape to presentflanges 9 and 5 extending in opposite directions from a center section9, and the tape 19 of this embodiment projects, as with the embodimentof Fig. 3, only from one side edge limits of the backing piece proper.The double-L. shape has this advantage, to-wit: it permits the crowningmember to be set and secured in place after the sheet 20 of wall-boardhas been nailed to the framing studs of the room, screws (not shown)being applied through the flange 9 into the jamb I6. Whether the backingpiece for the tape be of the channel type portrayed in Fig. 3 or thedouble-L type portrayed in Fig. 4 it is thought to be self-evident thatthe concerned backing piece can be shaped to give either a rounding orsquare finish to the edge being trimmed.

It is important to note that my strips 6 could be formed of an open-meshmaterial so that the putty l3 would impregnate and pass through thewings I and bind them to the wall-board but such is not necessary and itis more economical to use imperforate kraft paper, the lapping puttybeing sufiicient in and of itself to firmly anchor thesame. v

Minor changes may be resorted to without departing from the spirit ofthe invention and I therefore intend that the hereto annexed claim begiven a scope fully commensurate with the broadest interpretation whichthe employed language fairly permits.

What I claim is:

In dry-wall construction, in combination: two sheets of wall-boardplaced angular to one another with an edge of one abutting an edge ofthe other to conjointly present an outside corner, means crowning saidcorner and comprised of a wide ribbon of flexible material and acomplementing narrower strip of inflexible material centered upon andfirmly cemented to the ribbon so as to have edge portions of the ribbonproject laterally as wings well beyond each of the opposite side marginsof the strip, said inflexible strip being pre-formed to a sectionalshape conforming to the cross-sectional profile of the corner so thatthe strip closely fits the corner with the projecting wings in coveringrelation to adjacent portions of the wall-board lying at each side ofsaid corner, and putty-like material investing the wings and alsocovering portions of the two wall-boards which lie beyond the side-edgelimits of the wings, the applied putty being dressed flush with theexposed face of the Wall-board to produce a smooth unbroken surfacesubstantially conforming in appearance to a plaster wall and serving toimmobilize the wings and responsively hold the inflexible strip in a.fixed position over the corner proper.

ARTHUR H. IDUNLAP.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,041,799 Walper May 26, 19362,234,701 Lyman Mar. 11, 1M1

